185
SJ63 AJ+, SJ63 AJ 229043AAA
Hydraulic System - CE & AS Section 4 – Troubleshooting Information
4.6 Hydraulic System - CE & AS
4.6-1 All Controls are Inoperative
1. Broken or defective drive pump shaft or coupling. Check pump shaft and coupling. Replace if
defective.
2. Hydraulic oil level low. Check oil level. Fill to proper level.
4.6-2 All Boom Functions are Inoperative
1. Open or defective dump valve 2H-21A. Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
2. Stuck or defective relief valve RV1. Set valve to specifications. Check o-rings and clean
valve. Repair or replace valve as required.
3. System pump P2 defective. Test pump with flow meter. Replace if defective.
4. Plugged or defective high pressure filter F1. Check filter. Replace if plugged or defective.
4.6-3 No Main Boom Up
1. Stuck or defective lift up valve 5H-14. Clean valve. Check operation of valve. Repair or
replace valve as required.
2. Stuck or defective differential sensing valve
DSV3.
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
3. Stuck or defective check valve CV5. Clean valve. Check operation of valve. Repair or
replace valve as required.
4. Stuck or defective counterbalance valve CB9. Clean valve. Check O-rings on valve. Repair or
replace valve as required.
5. Defective lift cylinder C3. Check seals on cylinder. Replace as necessary.
Replace cylinder if defective.
4.6-4 No Main Boom Down
1. Stuck or defective lift down valve 5H-13. Clean valve. Check operation of valve. Repair or
replace valve as required.
2. Stuck in closed position or defective flow control
valve 2H-13A.
Clean valve. Check operation of valve. Repair or
replace valve as required.
3. Stuck or defective differential sensing valve
DSV3.
Clean valve. Check O-rings on valve. Check
operation of valve. Repair or replace valve as
required.
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